Catalyst for purifying diesel engine exhaust gas and method...

Details Catalyst for purifying diesel engine exhaust gas and method... Catalyst for purifying diesel engine exhaust gas and method...

B - Operations, Transporting

01

J

B01J 29/064 (2006.01) B01D 53/94 (2006.01) B01J 29/068 (2006.01) B01J 29/44 (2006.01) B01J 29/74 (2006.01) B01J 37/02 (2006.01) B01J 37/04 (2006.01) B01J 37/08 (2006.01) B01J 21/12 (2006.01) B01J 35/10 (2006.01)

Patent

CA 2466409

A catalyst which purges a diesel engine exhaust gas of HC, CO, and SOF and reduces the emission of particulates as well and a method for the production thereof are provided. The catalyst for purifying a diesel engine exhaust gas has deposited on a refractory three-dimensionalstructure a catalyst component comprising silica-alumina supporting at least one noble metal selected from the group consisting of platinum, palladium, and rhodium and zeolite. This catalyst is produced by adding a noble metal component into a slurry of silica-alumina thereby inducing chemical adsorption, then adding zeolite to the resultant mixture thereby obtaining a mixed slurry of a noble metal-supporting silica-alumina and zeolite, dipping a refractory three-dimensional structure in the slurry thereby inducing deposition of the catalyst component, and subsequently calcining the resultant composite.

L'invention concerne un catalyseur qui purge les gaz d'échappement de moteurs diesels (HC, CO et SOF) et réduit les émissions de particules, ainsi qu'une méthode de production s'y rapportant. Le catalyseur pour purifier un gaz d'échappement de moteur diesel comporte, sur une structure tridimensionnelle réfractaire, un composant catalyseur constitué de silice-alumine supportant au moins un métal noble sélectionné à partir du groupe composé de platine, de palladium, de rhodium et zéolite. Ce catalyseur est produit par l'ajout d'un composant de métal noble dans une bouillie de silice-alumine, ce qui induit une absorption chimique, puis par l'ajout de zéolite au mélange résultant. On obtient ainsi une bouillie mélangée de silice-alumine supportant un métal noble et de zéolite. La structure tridimensionnelle réfractaire est ensuite baignée dans la bouillie, ce qui induit le dépôt du composant catalyseur et la calcination subséquente du composite résultant.

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